[mc] mc slow start after upgrade from 4.8.22 to 4.8.29

[Fourhundred Thecat]

 > On 2023-08-12 10:55, Yury V. Zaytsev wrote:
> On Sat, 12 Aug 2023, Fourhundred Thecat via mc wrote:
>
>> Has anything changed between the versions, that would explain the
>> slowdown?
>
> I'd assume this might be related to starting the subshell. Try without
> subshell and see if it starts faster. If that's subshell, then you could
> check if you have anything that slows it down like plugins.

yes! when I start mc as "mc -u", it is lightning fast.

I normally start mc as: SHELL=/usr/bin/zsh /bin/mc

When i start without the SHELL definition, it also starts lightning fast.

But why is it?
Starting zsh alone is also lightning fast. Why is it slow in mc?